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VAS scores of two groups after operation. The levels of VAS decreased in Dex group compared with Con group at 6 h and 12 h after operation. ∗P < 0.05 and #P < 0.05 vs. postoperative 3 h in Dex group, and &P < 0.05 vs. postoperative 3 h in Con group. VAS: visual analogue scale; Dex: group administrated with dexmedetomidine; Con: control group received saline.
